EP1153362B1 - Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact - Google Patents

Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact Download PDF

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Publication number
EP1153362B1
EP1153362B1 EP00903646A EP00903646A EP1153362B1 EP 1153362 B1 EP1153362 B1 EP 1153362B1 EP 00903646 A EP00903646 A EP 00903646A EP 00903646 A EP00903646 A EP 00903646A EP 1153362 B1 EP1153362 B1 EP 1153362B1
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EP
European Patent Office
Prior art keywords
signal
unit
transponder
transmission system
data transmission
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EP00903646A
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German (de)
English (en)
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EP1153362A1 (fr
Inventor
Jürgen Kuttruff
Robert Reiner
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Infineon Technologies AG
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Infineon Technologies AG
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Definitions

  • the present invention relates to a contactless data transmission system, especially for transmission systems is suitable with so-called contactless chip cards.
  • These Systems enable data exchange between the chip card and a mostly stationary read / write station with the Purpose of identification of the cardholder, to effect a cashless payment or similar.
  • transponder for a smart card known from the properties of the received electromagnetic Wave concludes with what standard the Read-write device works.
  • the transponder will be included set to the recognized standard. For recognizing whether the transponder is in the near or far field becomes the stereo effect exploited.
  • the object of the invention is a contactless data transmission device with a transponder, in which the standard suitable for the transponder can be selected.
  • a transponder or a chip card of the transmission system a receiving unit with a receiving interface for receiving a sent from the read / write station RF signal and with an output terminal for providing a data signal formed in the receiving unit from the RF signal on.
  • the receiving unit has means for Receiving and processing of RF signals that vary modulated and / or coded.
  • the receiving unit is particularly suitable to receive RF signals, too demodulate and decode according to one or more generated the already existing transmission standards and were transferred.
  • the receiving unit is a processing unit for processing the signal obtained from the RF signal Data signal downstream.
  • the transponder also has a detection unit for Providing one of the power of the received RF signal dependent control signal.
  • the control signal is information about the power of the received RF signal and thus about the removal of the chip card from the read / write station based.
  • the transponder of the transmission system such a setting of the receiving unit and / or the processing unit on the transmission method, the for the determined distance between chip card and Write / read device is optimal.
  • An embodiment of the invention provides that the transponder a transmitting unit connected to the processing unit comprising, the means for generating at least two differently modulated and / or coded RF signals from one supplied by the processing unit Data signal has.
  • the transmitting unit is preferably depending on the control signal for generating different modulated and / or coded RF signals that belong to different Transmission standards belong, controllable.
  • Removes the user during a data transfer which is based on a first transmission method, for example because of a high data rate a small distance between smart card and write / read requires, from the read / write device, so allows the inventive system by switching to another transmission method, that works well even at greater distances, that the started data transfer ended or at least without Data loss can be canceled.
  • An embodiment of the invention provides, the detection unit directly to the receiving unit to connect to the latter to control depending on the control signal. whereas a further embodiment of the invention provides, the detection unit to connect to the processing unit and connect the receiving unit to the processing unit, around the receiving unit depending on the control signal via the processing unit to control.
  • the latter embodiment offers the advantage that the processing unit from the control signal the need for a change of Transmission method detects because the smart card, for example was removed from the read / write device, or that the Processing unit recognizes the possibility to a transmission method to switch at a higher data rate, because the Chip card was further approximated to the read / write device.
  • the processing unit may then transmit the transmission unit and the Adapt the receiving unit to the changed requirements and the respective transmission method in the processing of received data signal and the to the read / write station data to be transmitted.
  • This embodiment offers the further advantage that in the processing unit in addition to the control signal further parameters taken into account can be a change of the transfer process necessary appear.
  • the receiving unit preferably has at least two signal processing units for reception and processing of two differently modulated and / or coded RF signals on.
  • the signal processing units have it each a receiver, a demodulator and a decoder on.
  • the signal processing units have one or more of the components in common. distinguish For example, the RF signals only after Modulation type and coding, but not in the carrier frequency, is sufficient a receiver that tuned to the carrier frequency is and the two signal processing units can be together.
  • the signals differ only in their coding, receiver and demodulator can work together be used.
  • the components of the signal processing units preferably individually dependent on the control signal can be controlled.
  • the unneeded components are preferably switched off for power saving considerations.
  • the detection unit is for generating the control signal preferably connected to an output terminal of the receiving unit.
  • the receiving unit has besides the means for Demodulation and decoding of the RF signal via a power supply unit with a voltage regulator through Rectifying and smoothing the RF signal a supply voltage for the circuit components of the transponder for Provides.
  • a voltage regulator serves to maintain at least approximately constant Supply voltage. Voltage fluctuations that are due to A powerful RF signal will be provided by the Voltage regulator regulated. At the voltage regulator is so an information about the power of the received RF signal available to the detection unit for education the control signal can be supplied, as in one embodiment the invention is provided.
  • the read / write device has means for picking up one of the transponders received signal and depending on the received signal to switch the transmission method.
  • the read / write device of the invention Transmission system corresponding to the transponder Arrangement of receiving unit, processing unit and Transmitting unit, wherein the receiving unit means for receiving and for processing RF signals, the modulated at least two different ways and / or are encoded.
  • the transmitting unit preferably has means for Generation of corresponding differently modulated and / or coded RF signals.
  • Another embodiment of the invention provides that the Read / Write Device means for determining an error rate of the signals received from the transponder and means for switching the transmission method depends on the error rate having.
  • the transponder of the system according to the invention can also be used in Connection to be operated with a read / write device, in which not all transmission methods are implemented, which are implemented in the transponder. However, you can then not between all possible for the transponder transmission method change.
  • the processing unit the transponder is preferably designed so that they only change to such a transfer procedure allows for which a corresponding request signal from the Read / write device is received.
  • the invention further provides a method for Contactless data transmission according to claim 15.
  • the method provides in the system at the beginning the transmission, so if the processing unit with the Supply voltage is applied, first a transmission method adjust, even for larger distances between transponder and chip card works reliably and the transmission method then dependent on the control signal adjust.
  • FIG. 1 shows a block diagram of a transponder 1 of FIG transmission system according to the invention, for a data exchange with a read / write station according to various Transmission standards is suitable.
  • the transponder has to a receiving unit EME with a reception coil L as trained receiving interface for recording one of a read / write station transmitted RF signal.
  • the receiving unit EME At a Output terminal of the receiving unit EME is one of the RF signal generated first data signal DS1 tapped, the one the receiving unit EME downstream processing unit VE can be fed to an input terminal EK1.
  • the transponder has a transmitting unit SE with a transmitting interface designed as a transmitting coil L2 on.
  • the data to be transmitted are sent to the sending unit in Shape of a second data signal DS2 via an output terminal AK1 supplied from the processing unit VE.
  • the receiving unit EME and the transmitting unit SE a coil as transmitting and Reception coil can be common.
  • Both the transmitting unit and the receiving unit are to formed at least two differently modulated and / or encoded RF signals to receive and process or to generate.
  • the differently modulated and / or coded RF signals belong to different transmission standards, the transponder due to its construction can use, and over which the transponder with a Write / read device can communicate in which also at least one of these transmission standards is implemented.
  • the Ubertragungsstandards can thereby be used in the Modulation and coding, the maximum data rate and also distinguish the carrier frequency.
  • they are different Transmission standards for different Ranges, so different distances between transponders and read / write device suitable.
  • Such is for example the transmission standard for the proximity range according to ISO 14443 only suitable for ranges up to a maximum of 10 cm while the transmission standard for the Vicinity range according to ISO 15693 is suitable up to ranges of 1 m.
  • the choice of the transmission method takes place in the inventive Transmission system depends on the performance of the received RF signals, the information about the distance of Chip card or transponder from the read / write device gives.
  • the transponder 1 has a detection unit DE which one dependent on the power of the received RF signal Control signal SS generated, which controls the transmission and Receiving unit SE, EME and there to select the transmission method serves.
  • a detection unit DE which one dependent on the power of the received RF signal Control signal SS generated, which controls the transmission and Receiving unit SE, EME and there to select the transmission method serves.
  • the Detection unit DE is for generating the control signal SS in the example shown, directly to the receiving interface L of the receiving unit EME for the evaluation of the received Power connected.
  • FIG. 2 shows a further embodiment of the invention Transponders with the receiving unit EME, the transmitting unit SE, the processing unit VE and the detection unit DE.
  • the receiving unit EME has a first and a second signal processing unit on which a recipient EMP in common and the further one via a demodulator DEM1, DEM2 and each have a decoder DEC1, DEC2. outputs the decoder DEC1, DEC2 are at input terminals EK11, EK12 of the processing unit for supplying data signals DS11, DS12 connected.
  • the receiver has an input resonant circuit from a coil L and a parallel to it switched capacitor C. This parallel connection is a Rectifier GL downstream, in turn, a voltage regulator SR is downstream.
  • Output terminals A1, A2 of the Voltage regulator SR are at different potentials Vdd, Vss whose difference is a supply voltage for the Circuit components of the transponder results.
  • Vdd voltage difference
  • Vss voltage difference
  • the clarity is in Figure 2 only for the processing unit VE a connection to the supply potential located. It understands that the other components, like the demodulators DEM1, DEM2 and the decoder DEC1, DEC2 are connected to the power supply.
  • the detection unit is in the embodiment of FIG 2 to the processing unit VE for supplying the control signal SS connected.
  • the demodulator DEM1 and are the decoder DEC1 of the first signal processing unit for control to an output terminal AK21 of the processing unit VE, the demodulator DEM2 and the decoder DEC2 the second signal processing unit are for driving to another output terminal AK22 of the processing unit VE connected.
  • the transmitting unit SE has two signal processing units, each a coder COD1, COD2 and a modulator MOD1, MOD2 and those through the modulators MOD1, MOD2 driven transmit coil L2 is common.
  • the transmitting unit is used to generate an RF signal from a data signal DS21, DS22, the signal processing units supplied via outputs AK11, AK12 the processing unit VE is.
  • the modulators MOD1, MOD2 and the coders COD1, COD2 are also at outputs AK31 and AK32 of the processing unit VE connected and dependent on control signals SS3, SS4 controllable, depending on the processing unit VE be generated by the control signal SS.
  • the components DEM1, DEC1, DEM2, DEC2 each one of the signal processing units the receiving unit EME and the Components COD1, COD2, MOD1, MOD1 each one of the signal processing units the transmitting unit SE serve for Reception and processing or generation of RF signals according to one of the possible standards.
  • the illustrated Transponder is capable of two differently modulated and to process coded signals and thus a Transfer to two standards.
  • An implementation of more than two methods by providing additional Signal processing units in the receiving unit EME and the transmission unit SE is nothing in the way.
  • a control of the demodulators DEM1, DEM2, decoder DEC1, DEC2, coder COD1, COD2 and modulators MOD1, MOD2 preferably such that the components for the transmission method, which is not being used is switched off become.
  • the components ie demodulator DEM1; DEM 2 or decoder DEC1; DEC2, turn off.
  • the Components MOD1, MOD2, COD1, COD2 of the signal processing units the transmitting unit SE of which for the procedure just not needed to be shut down.
  • the demodulators or decoders are controlled as follows in FIG. 3 by way of example for a decoder DEC1 is via its supply voltage connection.
  • a Switch T1 between a supply terminal of the decoder DEC1 and a terminal for the supply potential Vss connected. Opening and closing the switch and thus turning on and off of the decoder DEC1 is dependent on the control signal SS1, which depends in the processing unit VE generated by the control signal SS of the detection unit DE becomes.
  • Another embodiment, not shown here provides, instead of or together with the Power supply one, not shown here, clock supply to prevent that of the functional unit to be switched off is supplied.
  • the illustrated transmission unit SE generates differently from the data signals DS21, DS22 modulated and coded RF signals accordingly in coders COD1, COD2 and modulators MOD1, MOD2 implemented coding and modulation method.
  • the Transmitting unit has only one transmission coil L2, which in particular is possible if the generated RF signals have the same carrier frequency exhibit. There is also the possibility of several Transmit and receive coils, for example one each Transceiver for each by means of the transponder to provide feasible transmission methods.
  • the data will be at different transfer rates transmit, accordingly, the bandwidth the transmitted RF signals different.
  • To minimize the signal-to-noise ratio is an adaptation of the reception bandwidth required by the recipient.
  • This adjustment can for example, by means of a not marked variable Load carried out between output terminals of the Rectifier GL is connected to the load of the out of the Coil L and the capacitor C formed parallel resonant circuit to increase. It is true that the reception bandwidth so the lower the load is.
  • the load is e.g. adjustable depending on the control signal SS, wherein the control signal SS directly or after processing by the processing unit can be used to adjust the load.
  • a load is also the downstream of the rectifier GL Voltage regulator SR, the so the resonant circuit more charged, the greater the power consumption of the Voltage regulator SR supplied components is.
  • a high data rate transmission method and accordingly high processing speed increases the Power consumption of the circuit, resulting in a higher load of the resonant circuit and thus a lower transmission bandwidth results.
  • An adaptation of the bandwidth to the transferable Performance thus happens partly automatically, in particular when the voltage regulator SR as a parallel voltage regulator, as shown in Figure 4, is formed.
  • the detection unit DE generates the control signal SS depending from the strength of the received RF signal, depending on the control signal SS, the receiving unit EME, the processing unit VE and the transmitting unit SE are controllable, that a change is made to a transmission standard, the for the determined from the power of the received signal Distance between transponder and read / write device especially suitable is.
  • a change of the transmission standard for example when removing the smart card from the read / write device Of course, only in accordance with the Read / write device in which the transmission standard, to be changed should be implemented.
  • the detection unit DE preferably to the voltage regulator SR of the receiver EMP connected.
  • the voltage regulator consists, as in FIG. 4 is shown, in the simplest case from a reference voltage source Vref, a comparator OP1 and a controllable Resistor T2.
  • the operational amplifier OP1 compares which are connected between the output terminals of the rectifier, voltage generated from the RF signal by rectification Vg with the reference voltage Vref.
  • the resistance of the between the output terminals A1, A2 of the voltage regulator SR switched resistor T2 will depend on the difference set between Vg and Vref, the resistance being so is smaller the larger Vg is to Vref.
  • the value of Voltage Vg is greater, the more powerful the received RF signal is.
  • the difference between the voltage Vg and the constant voltage Vref is thus suitable as a measure to serve for the strength of the received RF signal.
  • the detection unit In the simplest case DE has a comparator K, which compares the voltage Vg with the voltage Vref and at its output a digital control signal available whose value depends on whether the voltage Vg is greater than Verf and thus assumes a strong input level or whether the voltage Vg is less than Vref and thus a weak input level is assumed.
  • the Comparator may also be at a different location of the signal path be turned on in the voltage regulator to the control signal to create.
  • the detection unit has DE a sample-holding member, which ensures that short-term Voltage fluctuations Vg are not considered changes of the Control signal SS are passed.
  • the illustrated detection unit DE is only suitable if only between two transmission standards, for example, one for the proximity area and one for the proximity area the Vicinity area should be selected.
  • a Provide detection unit for example by means of a Quantizer provides a control signal which can take more than two values.
  • the functional structure of a read / write device with a transmitting unit, Receiving unit and processing unit corresponds essentially that of the transponder, on a detailed Representation is therefore omitted.
  • the subject matter of the method is furthermore a method for contactless data transmission, as in particular with the inventive transmission system is feasible.
  • the Method provides a transponder with a receiving unit, a processing unit, a transmission unit and a Detection unit to use, wherein the receiving unit and the transmitting unit are configured to be at least two different modulated and / or coded RF signals, such as in particular, they are the subject of different transmission standards are to receive and process or generate to be able to.
  • the aim of the method is, in particular, the transmission method to choose that depending on the distance between the transponder and the read / write station optimally is.
  • Is the transponder in the transmission range of a Read / write station and an RF signal from the receiver EMP receive generate the rectifier GL and the Voltage regulator SR is a supply voltage for the transmission, Receiving and processing unit SE, EME VE.
  • the receiving unit EME and possibly the transmitting unit SE first for the reception and transmission of RF signals of the transmission standard to adjust that in terms of distance between the read / write station and the transponder most robust is.
  • Another method for the first contact of the transponder with the read / write device provides that from the concern the supply voltage to the processing unit VE, from the processing unit VE the existing signal processing units of the receiver EME in succession until through one of the signal processing units a valid signal, usually a request signal, is received by the read / write device.
  • Each of the signal processing units is in the process of receiving and processing the signals of a transmission method designed, where the signals of different standards usually differ in modulation and / or coding. From the signal processing unit which is currently active detects the processing unit VE that of the Read / write station used transmission methods. The Processing unit then selects the corresponding signal processing unit the transmitting unit to contact the Write / read station to produce.
  • a change of the transfer procedure can after making the first contact depending on the power of the received RF signal.
  • the criteria for a change of the transfer procedure are stored in the processing unit, preferably programmable and, for example, has ROM or EEPROM. This offers the particular advantage that also for applications, where only one transmission method is used is to be used, the same hardware in the transponder can.
  • the applicable transmission methods for which the Hardware requirements are met on the transponder be by the processing unit by driving the corresponding encoders, modulators, demodulators and decoders selected.

Abstract

Système de transfert de données sans contact comprenant un transpondeur (1) et une station d'enregistrement/lecture, entre lesquels un échange de données peut s'effectuer au moyen d'un signal HF, système dans lequel le transpondeur (1) présente les caractéristiques ci-après: une unité de réception (EME) ayant une interface de réception (L) pour recevoir le signal HF, et une borne de sortie, à laquelle s'applique un signal de données (DS1) formé à partir du signal HF, l'unité de réception (EME) présentant des moyens (EMP, DEM1, DEM2, DEC1, DEC2) pour recevoir et traiter au moins deux signaux HF différemment modulés et/ou codés; une unité de traitement (VE) ayant une première borne d'entrée (EK1, EK11, EK12) qui est connectée à la borne de sortie de l'unité de réception (EME); une unité de détection (DE) pour la mise à disposition d'un signal de commande (SS) fonction de la puissance du signal HF reçu, l'unité de réception (EME) et/ou l'unité de traitement (VE) pouvant être commandées en fonction du signal de commande (SS).

Claims (15)

  1. Système de transmission de données sans contact comprenant un transpondeur (1 ) et un poste d'écriture/lecture, entre lesquels un échange de données peut être effectué au moyen d'un signal HF, le transpondeur (1) ayant les caractéristiques suivantes :
    une unité (EME) de réception ayant un interface (L) de réception du signal HF et une borne de sortie à laquelle s'applique un signal (DS1, DS11, DS12) de données formé à partir du signal HF, l'unité (EME) de réception ayant des moyens (EMP, DEM1, DEM2, DEC1, DEC2) de réception et de traitement d'au moins deux signaux HF modulés et/ou codés différemment ;
    une unité (VE) de traitement ayant une première borne (EK1, EK11, EK12) d'entrée qui est reliée à la borne de sortie de l'unité (EME) de réception ;
    une unité (DE) de détection de mise à disposition d'un signal (SS) de commande dépendant de la puissance du signal HF reçu, l'unité (EME) de réception et/ou l'unité (VE) de traitement pouvant être commandées en fonction du signal (SS) de commande ; et
    une unité (SE) d'émission qui est commandée en fonction du signal (SS) de commande pour la production d'un signal HF modulé et/ou codé suivant une première ou une deuxième façon,
       caractérisé en ce que le poste d'écriture/lecture comprend des moyens pour exploiter les taux d'erreur du signal HF reçus par le transpondeur et pour produire, en fonction du taux d'erreur, des signaux HF modulés et/ou codés différemment.
  2. Système de transmission de données suivant la revendication 1,
       caractérisé en ce que l'unité (SE) d'émission est munie d'une borne d'entrée, qui est reliée à une borne (AK1, AK11, AK12) de sortie de l'unité (VE) de traitement pour la réception d'un signal (DS2, DS21, DS22) de données et comprend un interface (L2) d'émission pour l'émission d'un signal HF portant l'information du signal (DS2) de données, l'unité (SE) d'émission ayant des moyens de production à partir du signal (DS2) de données d'au moins deux signaux HF modulés et/ou codés différemment.
  3. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce que l'unité (DE) de détection est reliée pour la commande directement à l'unité de réception et/ou à l'unité (EME) d'émission.
  4. Système de transmission de données suivant l'une des revendications 1 à 3
       caractérisé en ce que l'unité (DE) de détection est reliée pour l'envoi du signal (SS) de commande à l'unité (VE) de traitement et en ce que l'unité (VE) de traitement est reliée pour la commande de l'unité (EME) de réception et/ou de l'unité (SE) d'émission à celle-ci.
  5. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce que l'unité de réception a au moins deux unités de traitement du signal ayant des composants suivants : un récepteur (EMP), un démodulateur (DEM1, DEM2) et un décodeur (DEC1, DEC2).
  6. Système de transmission de données suivant la revendication 5,
       caractérisé en ce qu'un ou plusieurs des composants (EMP, DEM 1, DEM2, DEC1, DEC2) est commun aux unités de traitement du signal.
  7. Système de transmission de données suivant la revendication 5 ou 6,
       caractérisé en ce qu'au moins l'un des composants de chaque unité de traitement du signal peut être commandé en fonction du signal (SS) de commande.
  8. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce que l'unité (DE) de détection est reliée à une borne de sortie de l'unité (EME) de réception.
  9. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce que l'unité (EME) de réception a au moins un régulateur (SR) de tension pour mettre à disposition une tension (Vdd, Vss) d'alimentation qui est appliquée à l'unité (DE) de détection.
  10. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce qu'une largeur de bande du récepteur (EMP) peut être réglée en fonction du signal (SS) de commande.
  11. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce que l'unité d'émission a deux unités de traitement du signal ayant les composants suivants: un codeur (COD1, COD2), un modulateur (MOD1, MOD2), un émetteur (L2).
  12. Système de transmission de données suivant la revendication 11,
       caractérisé en ce qu'au moins l'un des composants (COD1, COD2, MOD1, MOD2) est commun aux unités de traitement du signal.
  13. Système de transmission de données suivant l'une des reve ndications précédentes,
       caractérisé en ce que le poste d'écriture/lecture a des moyens de réception d'un signal HF transmis par le transpondeur.
  14. Système de transmission de données suivant l'une des revendications précédentes,
       caractérisé en ce que le poste d'écriture/lecture a une unité de réce ption des signaux HF du transpondeur et une unité de détection de mise à disposition d'un signal de commande en fonction de la puissance du signal HF reçu, l'unité de réception et/ou une unité de traitement en aval de l'unité de réce ption pouvant être commandée en fonction du signal de commande.
  15. Procédé pour faire fonctionner un montage suivant l'une des reve ndications précédentes, comprenant les stades :
    de détection d'une intensité du champ de réception sur le transpondeur ;
    de production dans le transpondeur d'un signal de commande en fonction de l'intensité du champ de réception ;
    de réglage d'un type de modulation dans l'unité d'émission du transpondeur qui dépend du signal de commande ;
    d'exploitation d'un taux d'erreur du signal HF reçu par le transpondeur et
    de production de signaux HF modulés et/ou codés différemment en fonction du taux d'erreur.
EP00903646A 1999-01-29 2000-01-25 Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact Expired - Lifetime EP1153362B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00903646A EP1153362B1 (fr) 1999-01-29 2000-01-25 Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99101539 1999-01-29
EP99101539A EP1026627A1 (fr) 1999-01-29 1999-01-29 Système et méthode de communication sans contact
PCT/EP2000/000636 WO2000045330A1 (fr) 1999-01-29 2000-01-25 Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact
EP00903646A EP1153362B1 (fr) 1999-01-29 2000-01-25 Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact

Publications (2)

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EP1153362A1 EP1153362A1 (fr) 2001-11-14
EP1153362B1 true EP1153362B1 (fr) 2003-12-03

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EP99101539A Withdrawn EP1026627A1 (fr) 1999-01-29 1999-01-29 Système et méthode de communication sans contact
EP00903646A Expired - Lifetime EP1153362B1 (fr) 1999-01-29 2000-01-25 Systeme de transfert de donnees sans contact et procede pour le transfert de donnees sans contact

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EP99101539A Withdrawn EP1026627A1 (fr) 1999-01-29 1999-01-29 Système et méthode de communication sans contact

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US (1) US6836208B2 (fr)
EP (2) EP1026627A1 (fr)
JP (1) JP3808312B2 (fr)
DE (1) DE50004644D1 (fr)
WO (1) WO2000045330A1 (fr)

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Also Published As

Publication number Publication date
JP2002536855A (ja) 2002-10-29
EP1153362A1 (fr) 2001-11-14
US6836208B2 (en) 2004-12-28
WO2000045330A1 (fr) 2000-08-03
DE50004644D1 (de) 2004-01-15
US20020080864A1 (en) 2002-06-27
EP1026627A1 (fr) 2000-08-09
JP3808312B2 (ja) 2006-08-09

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